2143223857 has 2 divisors, whose sum is σ = 2143223858. Its totient is φ = 2143223856.

The previous prime is 2143223851. The next prime is 2143223861. The reversal of 2143223857 is 7583223412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1968164496 + 175059361 = 44364^2 + 13231^2 .

It is a cyclic number.

It is not a de Polignac number, because 2143223857 - 2¹¹ = 2143221809 is a prime.

It is not a weakly prime, because it can be changed into another prime (2143223851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1071611928 + 1071611929.

It is an arithmetic number, because the mean of its divisors is an integer number (1071611929).

Almost surely, 2^2143223857 is an apocalyptic number.

It is an amenable number.

2143223857 is a deficient number, since it is larger than the sum of its proper divisors (1).

2143223857 is an equidigital number, since it uses as much as digits as its factorization.

2143223857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80640, while the sum is 37.

The square root of 2143223857 is about 46294.9657846293. The cubic root of 2143223857 is about 1289.3055286884.

The spelling of 2143223857 in words is "two billion, one hundred forty-three million, two hundred twenty-three thousand, eight hundred fifty-seven".